The Advanced Recent Posts WordPress plugin through 0.6.14 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
https://wpscan.com/vulnerability/5fdd44aa-7f3f-423a-9fb0-dc9dc36f33a3